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非洲爪蟾卵母细胞分期与选用（基于 Dumont 标准）Oocyte staging & selection (Dumont)

实验技术Protocol

Dumont 标准依据直径、色素沉着与形态特征，将爪蟾卵母细胞分为六个时期（I–VI）。正确分期是微注射、蛋白表达与电生理实验稳定可重复的前提。The Dumont system classifies Xenopus oocytes into six stages (I–VI) by diameter, pigmentation and morphology — the basis for reproducible injection, expression and electrophysiology.

卵母细胞 I–VI 期的生长与色素分布变化；图中大小为概念比例。
卵母细胞 I–VI 期的生长与色素分布变化；图中大小为概念比例。 科研示意图。Conceptual growth and pigmentation changes across oocyte stages I–VI; sizes are schematic. Scientific schematic.
原图 1Original 1

分期标准Staging

分期Stage直径Diameter主要特征Features
I50–100 μm胞体透明，无色素Transparent, no pigment
II300–450 μm透明或淡白色Transparent / pale
III450–600 μm表面出现均匀色素Uniform pigment appears
IV600–1000 μm出现深色动物半球与白色植物半球Animal/vegetal hemispheres form
V1000–1200 μm两半球界限清晰，动物半球深黑发亮Clear hemisphere border
VI1200–1300 μm无色素带分隔，体积最大Unpigmented band, largest

实验选用建议Selection

  • 微注射（mRNA/cRNA）：推荐 VI 期——体积最大（注射量可至 100 nL）、结构完整、翻译效率高。Injection (mRNA/cRNA): prefer stage VI — largest volume (up to 100 nL), intact, high translation.
  • 电生理（电压钳）：推荐 II–III 期——体积小、电容低、噪声低、稳定时间短。Electrophysiology: prefer stage II–III — lower capacitance and noise.

选用参考：JoVE 卵母细胞离子通道表达与电生理实验方法Selection reference: JoVE oocyte channel expression and electrophysiology protocol

应结合直径测量与形态观察进行分期；保存于含抗生素的 0.1× MMR 中；大细胞注射需控制针径与压力。Combine diameter and morphology; keep in 0.1× MMR with antibiotics; control needle size and pressure.

参考文献References

  1. Dumont JN (1972) Oogenesis in Xenopus laevis (Daudin). I. Stages of oocyte development in laboratory maintained animals. J Morphol 136:153–180.
  2. Goldin AL (1992) Maintenance of Xenopus laevis and oocyte injection. Methods Enzymol 207:266–279.
  3. Sigel E (1990) Use of Xenopus oocytes for the functional expression of plasma membrane proteins. J Membr Biol 117(3):201–221.
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